Withdrawing device for web material wound on rollers



C. DE ROCHI Dec. 26, 1967 WITHDRAWING DEVICE FOR WEB MATERIAL WOUND ON ROLLERS 2 Sheets-Sheet l Filed April 8, 1966 MWF/vra? Caf/ de Pocw/ c. DE Roel-1| Dec. 26, 1967 WITHDRAWING, DEVICE FOR WEB MATERIAL WOUND ON ROLLERS 2 Sheets-Sheet 2 Filed April a, 196e W N 5 V w Carl de /FCH/ United States Patent O 3,360,209 ,WITHDRAWING DEVICE FOR WEB MATERIAL WOUND 0N ROLLERS "Carl de Rochi, St. Polten, Austria, assignor to Joh Kleinewefers Sohne, Krefeld, Germany Filed Apr. 8, 1966, Ser. No. 541,224 Claims priority, application 'ger-many, Apr. 12, 1965,

11 Claims. (Cl. 242-58) ABSTRACT F THE DISCLOSURE Numerous suggestions have been advanced which are intended to assure a continuous unwinding. oper-ation. A heretofore known device for the purpose involved consists primarily of rotatable arms adapted to be pivoted about a driven shaft one end of which supports the ready, full roller, whereas the other end supports the roller being unwound. By turning vor tilting the rollers while simultaneously decreasing the speed of the passing web, a glue covered area of the new full roller is pressed upon the roller being lunwound, whereupon the remainder of the web being unwound is separated. Since the construction kof these so-called Atilted winders with increasing size of the machine width of more than five meters and rollerlweights. up to ten tons operationally cannot be handled economically, and since furthermore the space required becomes too great while it is difficult to oversee the calender, devices have been suggested in which the rollers no longer turn about a shaft of rotation but are moved along horizontal paths. The full roller and the roller getting empty are arranged alongside each other but have to be driven in opposite direction with regard to each other. The gluing of the new web to the old web. is effected by tiltable pressing rollers arranged between the full and empty rollers. These pressing rollers glue the new .web alternately once on the left-hand roller and then on the right-hand roller. Aside from the fact that the construction is rather expensive, arrangements of this type have the great drawback, that the ready, full roller and the roller getting empty have to be rotated in opposite direction with regard to each other so that the 'paper webs with their screen and felt markings which are unavoidable but make the paper sides different, are solinterconnected that the felt side and the smooth side follow each other on the same side of the composite web.

It is, therefore, an object of the present invention to provide a withdrawing device for web material wound on rollers which will overcome the above mentioned drawbacks.

It is another object of this invention to provide a device as set forth above which will avoid the tilting arm arrangement above referred to.

These are other objects and advantages of the invention will appear `more clearly from the following specification in connection with the accompanyingdrawings, in which: v y

FIG. 1 is an elevation which shows an unwinding device according to which the full paper roller is by means of abutments actuated by spindles moved into its position of operation.

FIG. 2 is a view showing a modification according to which the full roller after having been released moves to the driving drum over a cam and during the unwinding operation exerts a constant pressure.

FIG. 3 is a fragmentary view which illustrates an embodiment in which the inclined running path includes an incline over which the full paper roller is pressed into contact with the driving drum.

According to the present invention the device for unwinding web material, especially paper webs, which device includes an automatic or controlled roller exchange, is characterized primarily by two horizontal, inclined, straight, or curved roller paths for receiving the tambour stud of the paper roll to be unwound and is furthermore characterized by Ia driving drum coupled to the calender drive and arranged between the roller paths. The arrangement is such that the paper roller which is rotated in conformity with the desired web speed, due to its own weight or a drive, rotates very closely to the driving drum, whereas the paper roller which continuously decreases in diameter, shortly prior to the complete unwinding, rolls over the driving drum and moves to an end abutment while between the tambour at the end abutment and the driving drum there will be provided a free paper path which at the instance of the establishment of the contact of the rubberized paper start of the new paper roll with the paper web being unwound is separated by manual or fully Aautomatic control by means of a knife.

With this arrangement it is` important that shortly before the one paper rollv becomes empty, the last mentioned roller, in view of its too small a diameter, rolls over the driving drum so that the new paper roll being ready can in the same direction of movement and in the same direction of rotation be moved against the driving drum, Thus, aside from various structural simplifications, the particular advantage of the present invention is seen in the fact that the paper webs are glued to each other always with the same side.

Referring now to the drawing in detail and FIG. 1 thereof in particular, all of the driving and supporting devices are mounted on a strong machine support 1 the upper end of which forms two slightly inclined roller paths 2. Slightly ahead of the left-hand end of the fnachine support, preferably in a bearing 3 which is adjustable as to height, there is arranged a driving drum 4. The diameter and location of the driving drum are so selected thatthe drum extends to a certain extent below the transverse edges of the roller paths 2. In order to assure that the paper webs on drum 4 adhere to each other, there is provided a pressure roller 6 which is supported by two levers 5. Roller 6 is adapted by means of adjustable pulling devices, for instance a pneumatic cylinder 7, to be pressed against driving drum 4. At the lefthand end of the roller paths or more specifically, slightly ahead thereof there are provided two abut-ments 8 against which the roller 9 being emptied moves by means of its tambour 10. Since the full roller has a large diameter, it is not able to overroll the driving drum 4. This is possible only after the web has almost been completely unwound, as is the case when the roller occupies approximately the position 11 (see FIG. 1).

are guided in threaded spindles 15 arranged on both sides of the roller paths 2 and are adjusted by said spindles in both directions over the same distance. The drive of the threaded spindles is for instance effected by a motor 16 through a uniform movement shaft 17 and chain drives 18 and can be controlled manually or automatically. The abutment 13 serves for guiding the paper roll 9 placed in readiness, whereas abutment 14 holds fast the unwinding roll at the culmination of driving drum 4 in the direction of the axis. As soon as the paper roll being unwound has become so small in diameter that it can pass over the driving drum, the abutrnents 13 and 14 are either by hand or automatically placed into movement toward the left whereby the roll, in the end position, will roll on the abutment 8 and from there will be unwound further, whereas the new roll placed in readiness closely ahead of the driving drum in position 9 moves against the driving drum, while the glue covered paper start 25-26 sticks to the unwinding path.

The unwinding operation and the exchange of the rolls are effected as follows. As soon as only a few layers are left on the tambour being unwound, the calender speed may be reduced, and the new paper roll which in the meantime, by means of two spindles 15, has been moved into the dash line position 9 of readiness7 is brought into contact with the driving drum by tilting the abutrnents 13. At the same time, a drum knife 23 actuated by a driving device 21 through a lever 22 is pushed into the path of the free paper web 12 whereby the paper path being unwound is severed. The tilting of the abutrnents 13 may be effected by any suitable device, for instance by a pneumatic latching arrangement not shown in the drawing which is adapted to be supplied with pressure uid from a conduit 19 through a pressure hose 20.

The end 25 to be glued on and pertaining to the new paper roll 9 has previously been supplied with an adhesive. In most instances, the ends are cut in a zigzag manner so that they will extend into the range of from point .25 to point .26 on the paper roll. During the gluing and pressing operation carried out in connection with the new paper roll for pressing the same against the driving drum, care is to be taken that this will take place at an instant at which the tips are located at point 25 of the paper start at the shortest distance from the driving drum or shortly ahead thereof. With only a little skill and by providing colored markings on the side surface of the paper web, the said work may be controlled manually. However, the invention also provides to release the pressure time point automatically, for instance by means of a stroboscopic surveying device.

After the new paper roll has been glued to the old paper roll and after the empty tambour has been moved away, the abutrnents 14 are returned to position 11 and the abutrnents 13 are returned to the uppermost location for receiving a new paper roll. Prior thereto, it was necessary to brake the empty tambour because due to its great weight of its own, the tambour has the tendency to continue to rotate for a certain time. In this connection, the pulling is effected advantageously by means of the same device which actuates the beating knife 23. For instance, at the levers 22 of the knife arrangement there is also provided a braking jaw 24. In order to prevent the tambour shaft from jumping when the paper roll decreases in diameter, confining rails 27 are arranged advantageously at both sides f the roller path.

The drive motor for accelerating the paper roll placed in readiness so as to bring the paper roll up to the paper velocity required at the instant the gluing operation takes place, is arranged in the machine support along an axial extension of the tambour and may selectively be drivingly engaged and disengaged by means of a manually or remote controlled clutch.

FIG. 2 shows a simplified embodiment according to the invention in which the spindles with the abutrnents yare no longer needed. According to a 'further development of this invention, the roller paths 2 are formed by a cam surface so that the rollers move rst from the highest point in a flat inclined section 28 which latter through a curve merges with section 28 of a greater incline. The curvature and the inclination within the range 29 are so selected that the full paper roll which has been brought into contact with driving drum 4 will during the unwinding operation be in engagement with the drum 4 at a constant pressure. The inclination within the range 28 is, however, so selected that the roll placed in readiness will after release of an abutment 31 at not too high a speed but at the proper time roll against the driving drum which event will take place approximately at the position 29.

Aibutment 31 is tilted at point 32 `and is actuated for instance by a pneumatic pressure cylinder 33.

To prevent the tambour from vibrating, two limiting rails 27 are provided which, however, in order not to interfere with the removal of the empty tambour must lbe foldable for instance -by folding about pivot 34 by means of 4a pressure cylinder piston system 35.

The rolling of the almost empty p-aper roll over the driving drum at point 30, the further movement to the left-hand end position, the separation of the -paper path within the range 12 and the braking of the empty tambour are effected in the same manner as described in connection with FIG. 1 while also the other devices are the same.

Still another embodiment of the present invention is illustrated in FIG. 3. With this arrangement, the roller paths are likewise curved but they start from the righthand abutment first with an ascending section 36 which merges at the culmination point 37 with the declining curved path or cam path. Therefore, at the correct gluing time, the full paper roll is by means of push levers 39 which are tiltable about pivot 38 and are actuated lby pulling cylinders pressed over the culmination point 37 ,and moves a short distance therebehind into contact with the driving drum 4. The remaining devices correspond to those ydescribed in connection with FIGS. 1 `and 2.

It is, of course, to be understood that the present invention is by no means limited to the particular embodiments shown in the drawing but also comprises any modifications within the scope of the -appended claims.

Thus, rfor instance, the roller paths may also be horizontal and the paper rolls being unwound may automatically be moved by a resilient spindle drive, or the roller paths may be a'djustaible as to their inclination. It is important in connection with the present invention that that roller which is being unwound will, shortly before it becomes completely empty, roll over the driving drum and subsequently the next paper roll will be kept in readiness for contact with the driving drum at a slight distance therefrom and at the same speed of rotation. The invention may be employed for the unwinding of paper, textiles and synthetic webs.

What I claim is:

1. An apparatus for unwinding web material from rollers in a continuous manner, especially for use in connection with calenders, which includes: a pair of laterally spaced roller guiding means for receiving and guiding a roller carrying web material to be unwound from said roller, driving drum means rotatably arranged between said roller guiding means and operable when guiding a web material carrying roller to unwind web material there. from, the respective uppermost portion of the circumferential surface of said driving drum means being located at a level lower than the level of said guiding means so as to permit a web material carrying roller only in nearly empty condition to roll over said driving drum means from the roller contacting side of said drum means to the opposite side thereof, and abutment means associated with said guiding means and larranged in spaced relationship to said drum means and on said opposite side in the path of said roller after the latter has rolled over said -drum means for arresting said roller.

cutter means for cutting la web section between said abutment means and said driving drum means.

3. An apparatus according to claim 1, in which said guiding means includes holding means for holding a roller in readiness to be moved subsequently into contact with said drum means for unwinding the material tfrom said roller, and in which said guiding means also includes threaded spindle means for moving the roller in said holding means toward said drum means.

4. An apparatus according to claim 3, which includes means operatively connected to said holding means for selectively making the same ineffective.

5. An apparatus according to claim 1, in which said guiding means comprises sections of different inclination to cause a roller to move gently into contact with said drum means for unwinding the web material 4from sai-d roller while maintaining said roller in contact with said drum means atan approximately constant pressure.

6. An yapparatus according to claim 5, in which that section of said guiding means which is remote from said drum means is ascending and in which that section of said guiding means which is adjacent said drum means is declining toward said drum means, and means operatively associated with said 4ascending section and operable to push a web material containing roller on said ascending section from the latter toward said declining section.

. 7. An apparatus according to claim 5, which includes means for adjusting the inclination of said sections of said guiding means.

8. An apparatus .according to claim 1, which includes brake me-ans arranged adjacent said abutment means for braking the roller adjacent said abutment means.

9. An apparatus according to claim 1, which includes confining rail means arranged adjacent said drum means for engagement with lateral portions of a web carrying roller in contact with said drum means to thereby prevent the latter when nearly empty from jumping.

10. An apparatus raccording to claim 9, in which said confining rail means are movable out of their eiective positions.

11. An apparatus according to claim 1, which includes elastic roller means continuously elastically -urged against sai-d driving dlrum means.

References Cited UNITED STATES PATENTS 2,703,682 3/1955 Jacobs 242--58.2 3,195,827 7/ 1965 Schowerer et al 242-582. 3,322,363 5/1967 Davids-0n et lal 24258.1

LEONARD D. CHRISTIAN, Primary Examiner, 

1. AN APPARATUS FOR UNWINDING WEB MATERIAL FROM ROLLERS IN A CONTINUOUS MANNER, ESPECIALLY FOR USE IN CONNECTION WITH CALENDERS, WHICH INCLUDES: A PAIR OF LATERALLY SPACED ROLLER GUIDING MEANS FOR RECEIVING AND GUIDING A ROLLER CARRYING WEB MATERIAL TO BE UNWOUND FROM SAID ROLLER, DRIVING DRUM MEANS ROTATABLY ARRANGED BETWEEN SAID ROLLER GUIDING MEANS AND OPERABLE WHEN GUIDING A WEB MATERIAL CARRYING ROLLER TO UNWIND WEB MATERIAL THEREFROM, THE RESPECTIVE UPPERMOST PORTION OF THE CIRCUMFERENTIAL SURFACE OF SAID DRIVING DRUM MEANS BEING LOCATED AT A LEVEL LOWER THAN THE LEVEL OF SAID GUIDING MEANS SO AS TO PERMIT A WEB MATERIAL CARRYING ROLLER ONLY IN NEARLY EMPTY CONDITION TO ROLL OVER SAID DRIVING DRUM MEANS FROM THE ROLLER CONTACTING SIDE OF SAID DRUM MEANS TO THE OPPOSITE SIDE THEREOF, AND ABUTMENT MEANS ASSOCIATED WITH SAID GUIDING MEANS AND ARRANGED IN SPACED RELATIONSHIP TO SAID DRUM MEANS AND ON SAID OPPOSITE SIDE IN THE PATH OF SAID ROLLER AFTER THE LATTER HAS ROLLED OVER SAID DRUM MEANS FOR ARRESTING SAID ROLLER. 